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There is an increasing interest to explore novel Doherty power amplifier (PA) architectures by utilizing digitally intensive architectures, i.e., RF power DACs, and mixed-signal techniques. In this paper, we will first review recent mixed-signal PA development. We will then present two mixed-signal Doherty PAs in CMOS. These digitally intensive designs enable precise controls of the Doherty main/auxiliary...
This paper presents a comprehensive theoretical study on Doherty power amplifiers (PAs) under antenna impedance mismatch. It is demonstrated for the first time that by varying the relative gain and phase of the carrier and peaking amplifiers, the PA performance degradation caused by the antenna impedance mismatch can be largely compensated. Such a compensation effect is discussed extensively for different...
This paper presents a digital Doherty polar power amplifier fully integrated in a 65nm bulk CMOS process. It achieves +27.3dBm peak output power and 32.5% peak PA drain efficiency at 3.82GHz and 3.60GHz, respectively. The PA demonstrates a maximum 7% back-off efficiency enhancement compared with a class-B PA and shows a robust Doherty PA operation against load variations. The 90° signal splitting...
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